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. 2014 May 20;14:224. doi: 10.1186/1472-6963-14-224

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Copyright © 2014 Sandbaek et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Percentage distribution of patient categories by population. A: Elective, U1, U2 and U3 percentages of total population. B: U1, U2 and U3 percentages of the non-elective population.